The possibility of enhancing the resistivity while preserving magnetism is investigated by growing metal/insulator trilayers and superlattices, where the metal is Gd and the insulator is amorphous Si3N4 for the first time. A large size effect on Curie temperature (TC) is found in the susceptibility in contrast with Gd epitaxially grown on metals. TC decreases to 180 K, i.e., 70% of the bulk TC in 10 nm thick Gd film, which is attributed to an electrical isolation and surface states. On the other hand, the susceptibility χ at TC is almost unchanged as in epitaxial Gd on metal. The resistivity R doubled as the Gd layer thickness decreases from 100 to 10 nm, and the TC estimated from R agrees with that from χ. Additionally, a possible interlayer coupling or an effect of surface layers adjacent to Si3N4 was detected in superlattices.
|ジャーナル||Journal of Applied Physics|
|出版ステータス||出版済み - 5 1 2000|
|イベント||44th Annual Conference on Magnetism and Magnetic Materials - San Jose, CA, 米国|
継続期間: 11 15 1999 → 11 18 1999
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)